摘要
本文提出一种分级紧致的动态信道分配(CCDCA)方案。文中首先根据信道使用情况与业务量的关系,将小区分成“冷态”和“热态”,并给出了相应的阈值,然后在对“热态”的处理过程中利用“冷态”的先验信息,对不同状态的小区给出了不同的紧致措施。该方案还能保证小区间有较小的服务偏差,提高了整个系统的服务质量。文中还根据冷、热态的特点构造了一个二维马尔科夫链模型,计算出了模型的主要参数;其思想可用于分析多种信道分配问题。仿真结果证明CCDCA方案有较小的呼阻率和较高的频谱利用率。
The paper presents a classified compact dynamic channel assignment (CCDCA) scheme for cellular mobile communications systems. A cell in the system is first classified as 揷old?and 揾ot?according to traffic load and the number of busy channels, and a threshold is defined, then the information obtained from the previous 揷old?state is used for channel assignment in the 揾ot?state. Different compact strategies are thus derived which can guarantee high quality of service (QoS) and low service deviation (SD). A two-dimensional Markov chain is developed and its main parameters are derived for the scheme, though it is also applicable to other channel assignment schemes. By simulation, the CCDCA is shown to be superior in terms of call blocking probability and spectrum utilization.
出处
《通信学报》
EI
CSCD
北大核心
2002年第9期42-48,共7页
Journal on Communications
基金
863青年基金资助项目
国家自然科学基金资助项目(60072040)
